Re: Proposal: Adding on

Nils Anders Danielsson schrieb:

On Fri, 03 Nov 2006, Duncan Coutts wrote:

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groupBy ((==) `on` fst)

Read it as "group by equality on first".

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vs groupBy (equating fst)

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So do you suggest that we deprecate and remove comparing?

Yes, this seems like a good idea. (I had forgotten that comparing was added before 6.6 was released.) I can add a deprecation pragma to my patch. Any objections?

Yes, "comparing" is mentioned in "ThingsToAvoid". Adding "equating" does do no harm. Style choices should be left to the user. Christian